571973

View detailed technical data, stock status, and sourcing information for: 571973
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-040-3134

Item Name Code

05488

Assigment Date

01/01/1963 (63 years ago)

A valve designed to automatically release excessive pressures. It is actuated by static pressure upstream of the valve and is used as a safety valve or relief valve, and may be set to close at a predetermined pressure. It is not designed for regulation of continuously fluctuating loads. It may be inline or cartridge (manifold) design. Excludes:valve (1), relief, pressure and temperature.

2b 1st end thread class, 2b 2nd end thread class, 2b 3rd end thread class, 2a 4th end thread class, right-hand 1st end thread direction

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class: 2a 4th end
Thread Class: 2b 1st end
Thread Class: 2b 2nd end
Thread Class: 2b 3rd end
Thread Direction: right-hand 1st end
Thread Direction: right-hand 2nd end
Thread Direction: right-hand 3rd end
Thread Direction: right-hand 4th end
Flow Control Device: poppet
Disk Loading Method: spring
Renewable Seat Ring Type: bonded
Connection Style: double threaded section boss fitting gasket with locknut sealing (boss) 4th end
Connection Style: flare(tube) 1st end
Connection Style: gasket seal(boss) 2nd end
Valve Operation Method: automatic
Connection Type: threaded external boss 4th end
Connection Type: threaded internal boss 2nd end
Connection Type: threaded internal boss 3rd end
Connection Type: threaded internal tube 1st end
Mounting Facility: bracket
Nominal Thread Size: 0.437 inches 2nd end
Nominal Thread Size: 0.437 inches 3rd end
Nominal Thread Size: 0.750 inches 1st end
Nominal Thread Size: 0.875 inches 4th end
Nominal Outside Diameter Tube Accommodated: 0.500 inches 1st end
Material: aluminum body
Material: steel flow control device
Material: steel seat
Surface Treatment: anodize
Style Designator: angle
Thread Series Designator: unf 1st end
Thread Series Designator: unf 4th end
Thread Series Designator: unf 2nd end
Thread Series Designator: unf 3rd end

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
222784	Safety Relief Valve
571973	Safety Relief Valve

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 4820-00-040-3134?

The FSCG of the NSN 4820-00-040-3134 is 4820

Does the NSN 4820-00-040-3134 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-040-3134 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 4820-00-040-3134 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-040-3134 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 4820-00-040-3134 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963